Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
  • B21B27/06—Lubricating, cooling or heating rolls
  • B21B27/10—Lubricating, cooling or heating rolls externally
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
  • B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B45/002—Increasing friction between work and working rolls by using friction increasing substance
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
  • B22F3/12—Both compacting and sintering
  • B22F3/1208—Containers or coating used therefor
  • B22F3/1216—Container composition
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
  • B23K20/002—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating specially adapted for particular articles or work
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
  • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
  • C04B35/45—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on copper oxide or solid solutions thereof with other oxides
  • C04B35/4521—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on copper oxide or solid solutions thereof with other oxides containing bismuth oxide
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
  • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
  • C04B35/45—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on copper oxide or solid solutions thereof with other oxides
  • C04B35/4521—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on copper oxide or solid solutions thereof with other oxides containing bismuth oxide
  • C04B35/4525—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on copper oxide or solid solutions thereof with other oxides containing bismuth oxide also containing lead oxide
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
  • C22C29/12—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on oxides
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C5/00—Alloys based on noble metals
  • C22C5/06—Alloys based on silver
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10N60/00—Superconducting devices
  • H10N60/01—Manufacture or treatment
  • H10N60/0268—Manufacture or treatment of devices comprising copper oxide
  • H10N60/0801—Manufacture or treatment of filaments or composite wires
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
  • B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
  • B21B2001/383—Cladded or coated products
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
  • B21B27/005—Rolls with a roughened or textured surface; Methods for making same
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49002—Electrical device making
  • Y10T29/49014—Superconductor

Definitions

• the present invention relates to a method of preparing an oxide superconducting wire, and more particularly, it relates to improvement for increasing the critical current density as well as the length of an oxide superconducting wire.
• superconductive materials of ceramics i.e., oxide superconductive materials
• oxide superconductive materials are watched with interest due to higher critical temperatures thereof.
• bismuth, yttrium and thallium oxide superconductive materials which exhibit high critical temperatures of about 110 K, 90 K and 120 K respectively, are expected for practical application.
• a bismuth oxide superconductor contains phases having critical temperatures of 110 K, 80 K and 10 K respectively. It is also known that the 110 K phase has a 2223 composition in a composition of Bi-Sr-Ca-Cu or (Bi, Pb)-Sr-Ca-Cu with Bi being partially replaced by Pb, while the 80 K phase has a 2212 composition in the same composition.
• an oxide superconductor or raw material powder therefor is filled up in a metal sheath of silver or a silver alloy, for example, and subjected to deformation processing and heat treatment, so that the oxide superconductor or the raw material powder contained in the metal sheath is sintered and brought into a superconducting state.
• This method is advantageously applied to preparation of a long superconducting wire, for example.
• an object of the present invention is to provide a method of preparing an oxide superconducting wire, which can improve denseness of an oxide superconductor or raw material powder therefor, being filled up in a metal sheath, thereby providing a high critical current density uniformly along its longitudinal direction.
• the present invention is directed to a method of preparing an oxide superconducting wire comprising the steps of filling up raw material powder for an oxide superconductor in a metal sheath and rolling the same in this state, and in order to solve the aforementioned problem, the rolling step comprises a step of increasing frictional force on surfaces of rolls employed for the rolling.
• raw material powder for an oxide superconductor includes powder of an oxide superconductor already exhibiting superconductivity, raw material powder, not yet exhibiting superconductivity, capable of forming an oxide superconductor, and a mixture of such powder materials.
• such a step may be carried out after heat treatment, or rolling and heat treating steps may be repeated.
• the frictional force on the surfaces of the rolls for the rolling may be increased by various methods such as a method of providing the surfaces of the rolls with films having larger frictional force than the roll surfaces, a method of performing rolling while applying a coating material onto the roll surfaces in the said method, a method of roughening the roll surfaces, and the like, for example.
• the frictional force on the surfaces of the rolls is so increased as to apply a larger load to the powder which is filled up in the metal sheath, thereby further densifying the powder and improving bonding properties between grain boundaries.
• the raw material powder for an oxide superconductor which is filled up in the metal sheath, is so densified that it is possible to obtain a long oxide superconducting wire having a high critical current density.
• such film portions may be deformed or converted if a long wire is rolled.
• Bi2O3, PbO, SrCO3, CaCO3 and CuO were mixed to prepare powder containing Bi, Pb, Sr, Ca and Cu in composition ratios of 1.8:0.4:2:2.2:3.
• This powder was heat treated at 800°C for 8 hours, and pulverized in an automatic mortar for 2 hours. Thereafter the as-formed powder was heat treated at 860°C for 8 hours, and again pulverized in a similar manner to the above.
• the as-obtained fine powder was filled up in silver pipes of 30 mm in outer diameter and 20 mm in inner diameter, and subjected to wiredrawing and rolling. Such samples were drawn into 1 mm in outer diameter, while surfaces of rolls employed for rolling these samples were under the following conditions:
• the samples were heat treated in the atmosphere at 845°C for 50 hours, and then gradually cooled.
• the samples were again rolled under conditions similar to the above, and heat treated at 840°C for 50 hours.
• Critical current densities of the as-obtained oxide superconducting wires were measured at a temperature of 77.3 K over lengths of 1 m, 10 m, 100 m and 1000 m respectively, while values of denseness in portions of 1 m in length were also measured. Table 1 shows the results. Table 1 Rolling Condition A B C D E Wire Length (m) Critical Current Density (A/cm2) 1 15000 22000 30000 32000 32200 10 11000 20000 24500 15000 27000 100 8000 15000 22000 10000 24000 1000 4000 12000 20000 5000 22000 Denseness in Portion of 1 m (g/cm3) 5.6 6.1 6.3 6.4 6.4

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Mechanical Engineering (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Manufacturing & Machinery (AREA)
• Ceramic Engineering (AREA)
• Metallurgy (AREA)
• Structural Engineering (AREA)
• Superconductors And Manufacturing Methods Therefor (AREA)
• Inorganic Compounds Of Heavy Metals (AREA)
• Wire Processing (AREA)

Applications Claiming Priority (2)

Publications (2)

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ID=13034654

Family Applications (1)

Country Status (6)

Cited By (3)

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Citations (2)

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• 1991
  • 1991-03-20 JP JP3056697A patent/JPH04292820A/ja active Pending
• 1992
  • 1992-03-18 CA CA002063285A patent/CA2063285C/en not_active Expired - Lifetime
  • 1992-03-19 DE DE69204506T patent/DE69204506T2/de not_active Expired - Fee Related
  • 1992-03-19 EP EP92104827A patent/EP0504908B1/de not_active Expired - Lifetime
  • 1992-03-20 AU AU13060/92A patent/AU654335B2/en not_active Ceased
• 1994
  • 1994-01-25 US US08/186,219 patent/US5434130A/en not_active Expired - Fee Related

Patent Citations (2)

Non-Patent Citations (2)

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